LR1Q21: A,B,C,D all dwells on the incumbent, E is the only answer dealing with the party. Based on the stem, the scandal is strictly in the scope of party, not incumbent.

LR1Q24: The correct answer to me is very self-evident, i dont really how to explain why the wrong answers are wrong, because it's not the nuance kind, they are simply so wrong...

LR2Q15: The error in the stem is that: it should take more miles to reach the break-even point, not fewer. In C, The roadmaker should be more advantageous when the wages are high because every reduced staff will save more money. The intrinsic logic in B is coherent.